[root@ ~]# mysql -h 192.168.0.* -uroot -p
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mysql> show global variables like 'wait_timeout';
+---------------+-------+
| Variable_name | Value |
+---------------+-------+
| wait_timeout | 28800 |
+---------------+-------+
1 row in set (0.00 sec)

mysql> set global wait_timeout=86400;
Query OK, 0 rows affected (0.00 sec)

mysql> show global variables like 'wait_timeout';
+---------------+-------+
| Variable_name | Value |
+---------------+-------+
| wait_timeout | 86400 |
+---------------+-------+
1 row in set (0.00 sec)

mysql>